[1] It starts out near the Embarcadero waterfront, with a half-block gap on Telegraph Hill before resuming near Montgomery Street, then runs through Russian Hill and a shopping district in Cow Hollow, ending in the Presidio.

Union Street also marks the dividing line between Cow Hollow and Pacific Heights to the south.

[2] It is the only east–west street that allows two-way traffic to traverse Russian Hill (all others have gaps or one-way segments).

The Muni 45 Union/Stockton and 41 Union bus lines, both utilizing Union Street, are the only Muni bus lines that cross Russian Hill east-west.

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